Industry 4.0 (I4.0) technologies are key drivers of digital transformation. This is why adopting I4.0 technologies is critical for companies to remain competitive. However, the adoption process requires careful planning, strategic decision-making, and a deep understanding of organizational needs and challenges. This paper aims to develop a comprehensive model that ensures the successful adoption of I4.0 technologies in small and medium-sized enterprises (SMEs). The data on which the model is based was collected using a variety of methods. Existing frameworks were reviewed by conducting a systematic literature review. The research group identified 25 fields of action that are categorized into the dimensions of Technology, Organization, Environment, and Expectations. A quantitative survey of 50 experts provided information on the relevance of these fields of action. Subsequently, meta-requirements and the resulting design principles were derived for the first prototype of the model. To gather insights on the prototype and research, six semi-structured expert interviews were conducted. The insights gained from the interviews will be taken into account in future research. The research provides SMEs with a model that addresses their specific technology adoption needs, facilitates their digital transformation, and enables them to realize the full potential of I4.0 technologies.